network goes down in afternoon

hi,

w2k small biz server, less then 100 nodes all on same subnet.

last monday 1-3 users started being kicked off the network. usually just 1 user in particular, but others have went down a couple of times too. while they are down, nobody can browse the internet either. I installed capra packet sniffer to try and isolate. i am seeing alot of netbios ssn traffic. unfortunately, I don't work at this site all of the time, and by the time I get there, the problem has went away, i have been there once while it happened, but that was before i installed capra. it always happens in the afternoon and goes away from 15 min, to a couple of hours later.

no backups. I havn't been able to observe the problem since installing capra. It went down today, I tried to get in via terminal server but it wouldn't let me, which I figured would happen since the internet was down. I could still ping the external address of the router though, so I know the problem isn't with the isp.

This happens every afternoon? After happen then near those clients? Anything that could be an environmental variable perhaps? Like they are near a generator or something goofy that kicks on and causes crosstalk to kick them off. Or maybe its near the server.

To add....ive seen people want to put servers near generators, environmental units and other such devices so I had to ask...

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rda123Author Commented: 2004-04-12

no changes like that afaik, I will ask about that though. this just started last monday. they use norton corporate, and it is up to date or I would have thought it was some weird virus. I checked the main users pc that goes down completely the most for spyware, nothing too bad was in it.

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rda123Author Commented: 2004-06-14

i fixed the problem. It finally went down and stayed down while i was there allowing me to troubleshoot deeper. I traced it down to one part of the building that is fed by one wire to a hub. the wire was going through a surge suppressor before going into the hub. I plugged the wire into the hub directly and the problem went away.

I still don't know why it would only go down in the afternoon, but as long as it's fixed, i'm not going to fret over it.